| … | |
… | |
| 28 | |
28 | |
| 29 | #if __GNUC__ >= 3 |
29 | #if __GNUC__ >= 3 |
| 30 | # define is_constant(c) __builtin_constant_p (c) |
30 | # define is_constant(c) __builtin_constant_p (c) |
| 31 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
31 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
| 32 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
32 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
|
|
33 | # define noinline __attribute__((__noinline__)) |
| 33 | #else |
34 | #else |
| 34 | # define is_constant(c) 0 |
35 | # define is_constant(c) 0 |
| 35 | # define expect(expr,value) (expr) |
36 | # define expect(expr,value) (expr) |
| 36 | # define prefetch(addr,rw,locality) |
37 | # define prefetch(addr,rw,locality) |
|
|
38 | # define noinline |
| 37 | #endif |
39 | #endif |
| 38 | |
40 | |
| 39 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
41 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
| 40 | # define decltype(x) typeof(x) |
42 | # define decltype(x) typeof(x) |
| 41 | #endif |
43 | #endif |
| … | |
… | |
| 407 | |
409 | |
| 408 | // Xorshift RNGs, George Marsaglia |
410 | // Xorshift RNGs, George Marsaglia |
| 409 | // http://www.jstatsoft.org/v08/i14/paper |
411 | // http://www.jstatsoft.org/v08/i14/paper |
| 410 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
412 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
| 411 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
413 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
|
|
414 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
| 412 | struct xorshift_random_generator |
415 | struct xorshift_random_generator |
| 413 | { |
416 | { |
| 414 | uint32_t x, y; |
417 | uint32_t x, y; |
| 415 | |
418 | |
| 416 | void operator =(const xorshift_random_generator &src) |
419 | void operator =(const xorshift_random_generator &src) |
